Want to make your very own heat packs? Using Lupin / Lupini beans and 100% cotton material + 100% cotton thread you can DIY at home easily.
Lupin is a great alternative because it is odourless when heated unlike traditional heat bags which develop a 'cooked' or 'burnt' smell over time. Lupins also retain their heat for longer, they are lighter than wheat and they don't sweat when heated.